ITER Magnets Update European perspective
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1 ITER Magnets Update European perspective Hannu Rajainmaki, Boris Bellesia, Alessandro Bonito-Oliva, Eva Boter, Thierry Boutboul, Eugen Bratu, Marc Cornelis, John Fanthome, Robert Harrison, Peter Readman, Carlo Sborchia, Pierluigi Valente Fusion for Energy ITER Department Magnets Group 4 November 2010
2 Outline Introduction: ITER Magnet System Procurement Arrangements and Schedule Cable-in-Conduit Conductors Design and Manufacture Toroidal Field (TF) Coils Poloidal Field (PF) Coil Central Solenoid (CS) Coils Correction Coils (CC), Magnet Supports and Coil Feeders Summary Slide 2
3 ITER Magnet Systems 48 Superconducting Coils: 18 TF coils 6 CS modules 6 PF coils 9 pairs of CC Feeders (for comparison Æ 10.5 GJ magnetic energy in the 27 km tunnel of the Large Hadron Collider at CERN) Slide 3
4 ITER Magnets sharing Component IO CN EU KO JA RF US TF Conductors 7% 20% 20% 25% 20% 8% TF Windings + Insertion 10 coils 9 coils TF Case Sections 100% Pre-compression Rings 100% TF Gravity Supports 100% CS Conductors 100% CS Coils + Structure 7 coils PF Conductors 71% 11% 18% PF Coils 5 coils 1 (PF1) PF Supports 100% CC Conductors 100% CC + Supports 18 coils Magnet Feeders 100% Instrumentation 100% 18 Procurement Arrangements signed up to now, the last 2 to be signed by 2010 Slide 4
5 Logistics of TF Coils TF Coils Japan Europe TF Coil Cases Japan Conductors China South Korea Japan Russia United States Europe Courtesy of A. Maas, ITER Slide 5
6 ITER Magnets Schedule TF and CS Coils 2 years qualification programme with the manufacture of mock-ups and dummy windings Delivery of the first conductors in 2010 Start of installation of the first PF and TF coils in 2015 Completion of the deliveries with the last PF coil and CS coils in 2017 A true managerial and technological challenge... Slide 6
7 ITER Cable-In-Conduit-Conductor Design Sub-cable Sub-cable Wrap Central Cooling Channel Spiral Co-twisted S/C Strands Jacket Cu Strand TF Cable Wrap CS, PF, CC All four magnet systems (TF, CS, PF and CC) are using the same concept Strand type (NbTi or Nb 3 Sn) defined by max. field Number of strands defined by nominal current Outer conduit material and shape (round, square) defined by magnet design Production started in 2008 (strand, cabling & jacketing) Slide 7
8 Conductor Manufacture Conductor Sub-Wrap 3rd Stage 1st Stage Strand Cu Wire Cable 4th Stage 2nd Stage Cu Core Cable Jacket Assy Wrap Cu Sub-Cable Jacket Central Spiral Slide 8
9 Strand Production More than 1,600 billets (100 tons of TF strand) registered in Database Stepping up to 100 tons/year, an increase of two orders of magnitude from previous Nb 3 Sn worldwide production rate Most material from JA, followed by KO, RF, EU and US: Majority of billets in work, but being released Slide 9
10 Cabling & Jacketing Final cable covered by steel wrap After final wrap, cable ready for insertion and compaction into jacket Final stage (5th) cabling around central spiral Welding and inspection of circular and square extruded tubes Several thousands of stainless steel tubes to be produced and welds to be made and inspected Slide 10
11 Jacketing Facilities TF & CS Facility in JA Jacketing Equipment in RF First JA full length dummy conductor completed in 2010 TF & PF Facility in CN KO may use JA jacketing facility EU and US facilities construction to be started soon TF Facility in RF Slide 11
12 Toroidal Field Coils Number of coils 19 Total stored energy (GJ) ~41 Max. conductor field (T) 11.8 Superconductor Nb 3 Sn Operating current (ka) 68 Operating temperature (K) 5 Number of turns 134 Height (m) 12.6 Weight (t) ~310 Centering force per coil (MN) ~400 Discharge time constant (s) 11 Max. voltage (kv) 7 Design validation through TF Model Coil tested in 2001 Slide 12
13 Wind, React and Transfer The TF coils are made using Wind,React&Transfer -technique. The complex manufacturing technique, together with the large dimensions, makes the TF coil a huge technological challenge. The major issue is the permanent deformation of the superconductor winding during heat treatment, which makes complex the transfer into radial plates Note: up to 10 conductor supplies with different behaviour. EU has chosen a multiple split procurement between radial plates, coil windings and insertion in the cases Contract for winding manufacture awarded to Iberdrola/ASG/Elytt in July 2010 JA to use one prime contractor, Toshiba, at least for the first two years of preparation phase, with the manufacture of prototypes of coil winding, radial plates and cases 1/3 scale winding table for TF coil prototype (JA) Qualification of irradiation resistant resin system with epoxy/cyanate ester blend completed. Slide 13
14 The challenge of transfer of reacted conductor inside the TF radial plates Open TF coil double pancake Radial plate (under the support) Radial plate articulated support Support platform Umbrella structure Heat treatment support Slide 14
15 Radial Plate Prototypes (EU) Machined side radial plate segment (CNIM) Radial plate segment produced by powder HIPping (SIMIC) Assembly of radial plate with GTAW welding (SIMIC) Slide 15
16 TF Coil Case Preparation Work (JA) Prototype of the side plate for TF coil case under forging process (above) and finished shape (below) Slide 16
17 Poloidal Field Coils 24 m Conductor field limited to 6.5 T NbTi, three grades of conductors depending on max. field Coils are large (24 m diameter) but use of NbTi simplifies construction Design validation through PF Insert Coil tested in 2008 Slide 17
18 PF Coil Fabrication Proposed winding scheme by EU DA: call-for-tender for manufacture of PF2-PF6 is in progress, supply contract to be placed in early 2011 Winding tooling prepared by RF DA for PF1 double pancakes: insulating and impregnation equipment & devices have been designed and procurement is in progress Slide 18
19 PF Coil Manufacturing Building On-site in Cadarache 18m (Manufacturing stages superimposed) Slide 19
20 Central Solenoid Coils Number of modules 7 Total stored energy (GJ) ~6.4 Max. conductor field (T) 13 Superconductor Nb 3 Sn Operating current (ka) 45 Operating temperature (K) 5 Turns per module 535 Total weight of coil assembly (t) ~980 Max. voltage to ground (kv) 20 CS stack composed of 6 independently powered modules wound in hexa-pancakes Detailed design phase in progress after PA signature Design validation through CS Model Coil tested in 2000, but new CS Insert required to confirm conductor performances under tensile hoop load conditions Slide 20
21 Correction Coils & Magnet Supports (CN) Correction Coils: detailed design and analysis activity complete, qualification of winding/insulation equipment and coil case manufacture/welding in progress, manufacture of dummy conductor complete PF Coil Clamps and Gravity Supports: detailed design and analysis complete, qualification of manufacturing techniques started Magnet Feeders and Current Leads: detailed design of in-cryostat feeders and outer terminal boxes under final review, R&D on critical components started Slide 21
22 EU Magnets Present Status 1/3 EU will supply 10 TF coils and 5 PF coils Contracts signed in : Cu strand for TF conductors (62 tons) Nb 3 Sn strand for TF conductors (total 95 tons) TF conductor qualification testing (completed in 2009) Spools of non-plated Cu strand (Luvata) Nb 3 Sn strand drawing machine (OST) Part of Nb 3 Sn strand testing machine (EAS) Slide 22
23 EU Magnets Present Status 2/3 Contracts signed in (continued): Side radial plate prototype for TF Coils Central radial plate prototype (different manufacturing method) for TF Coils TF coil casing closure welding qualification Side radial plate prototype mock-up machining (CNIM) Central radial plate mock-up section welding set-up (SIMIC) Central radial plate prototype mock-up (SIMIC) Slide 23
24 EU Magnets Present Status 3/3 Contracts signed in 2010: PF Conductor testing in SULTAN Supply of 10 TF winding packs Supply of Cabling & Jacketing of TF & Jacketing of PF conductor (awarded) Contracts in tender in 2010: Strand characterization of TF Nb 3 Sn samples Engineering study of TF winding pack cold testing and insertion Supply of 5 PF coils (PF2 to PF6) Slide 24
25 EU Magnets Next Steps Contracts in tender in 2011: Supply of 9 Pre-compression Rings Supply of NbTi strand characterization Supply of TF Radial plates TF Winding Packs Cold Test (if approved by ITE Council) and Insertion into Coil Cases Slide 25
26 Summary Conductors: ~100 tons of strand manufactured; mass production of superconducting strand established; most of manufacturing lines and production facilities in 6 ITER Members either ready or almost complete. TF Coils: First qualification stage of the TF coil manufacture started; full scale mock-ups of radial plates and windings being manufactured. CS Coils: Detailed design of the coils and their support structure in progress, especially for some critical items like joints and terminations; start up of several qualification and preparation activities has taken place. PF Coils: Manufacturing equipment already been prepared for PF1; supply contract for the EU coils to be placed in early Manufacture of the Correction Coils and the TF/PF supports starting; design of the Magnet Feeders still needs to be finalized due to the complicated interfaces. NOTE: Unexplored technologies + technical complexity + huge sizes + high quality requirement + very tight delivery schedules + logistics = CHALLENGE! Slide 26
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